Interviews with the leaders, practitioners, and change-makers in the global Passive House movement. A production of Passive House Accelerator.
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Matthew Cutler Welsh Podcasts

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247: Natural Materials and Collective Power
58:18
58:18
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58:18In this episode of the Passive House Podcast Jay Fox talks with Ace McArleton of New Frameworks about building with straw-insulated prefab panels, creating inclusive workspaces in the trades, and launching the Seed Collaborative to scale low-carbon construction through shared knowledge and collective action. https://www.newframeworks.com/ Thank you…
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246: Scaling Retrofit with Kore: Passive House in Practice in Ireland
51:44
51:44
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51:44In this episode of the Passive House Podcast, Mary James speaks with Barry McCarron, Managing Director of Kore Retrofit, about Ireland’s bold retrofit efforts and Passive House leadership. Barry traces his journey from building the world's largest Passive House Premium project to leading cutting-edge retrofit initiatives through Kore’s one-stop sho…
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TRE 09: Building Better Together Everywhere
34:20
34:20
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34:20In this ninth episode of The Reimagine Edit, host Zack Semke weaves together insights from the Reimagine Buildings 25 conference and a month of rich conversations inside the Reimagine Buildings Collective—including AMAs, Reimagine Tuesday interviews, and the post-conference after party. From the growing momentum behind high-performance prefab to ti…
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245: NYSERDA Buildings of Excellence Round Five Awards
36:20
36:20
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36:20On this episode of the Passive House Podcast join Michael Ingui as he chats with the NYSERDA Buildings of Excellence Round Five Award winners. From groundbreaking Passive House projects in Manhattan, Buffalo, and the South Bronx to deep retrofits and adaptive reuse in Brooklyn and beyond, we hear from architects, developers, and engineers driving h…
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In this episode of the Passive House Podcast, hosts Mary James and Ilka Cassidy sit down with Kristina Held, principal and founder of Held Architecture. Kristina shares her fascinating path through architectural education in Serbia, Germany, and the U.S., and how that global experience shaped her approach to Passive House. From humidity challenges …
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243: Scaling Small: ADUs and the Future of Housing
1:19:19
1:19:19
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1:19:19In this episode of The Passive House Podcast, Mary James sits down with Parlin Meyer, Managing Principal of BrightBuilt Home, and Chris Lee, Head of Design & Development at Backyard ADUs, for a deep dive into the growing world of accessory dwelling units (ADUs). Together, they explore how prefabrication, modular construction, and progressive policy…
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242: Heritage Meets Sustainability: Inside the Malcolm Shabazz Harlem Plaza
1:04:12
1:04:12
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1:04:12In this episode of the Passive House Podcast, Jay Fox and Mary James talk with Lisette Wong and Jack Esterson of Think! Architecture & Design to explore the award-winning Malcolm Shabazz Harlem Plaza project. Learn how this project blends community heritage with Passive House sustainability in Harlem. Lisette and Jack share their journey to Passive…
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TRE 08: Reimagining Design, Construction, and Materials
40:10
40:10
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40:10In this eighth episode of The Reimagine Edit (TRE) series of the Passive House Podcast, host Zack Semke shares selected clips of insights from Ed May (bldgtyp), Nakita Reed (Quinn Evans), Tessa Bradley (Artisans Group), Bev Craig (MassCEC), Mike Steffen (Walsh Construction), Lisa White (Co-Executive Director of Phius), and Jonsara Ruth and Allison …
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241: Sarah Lewis on Scotland’s Bold Housing Future
1:03:23
1:03:23
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1:03:23In this episode of the Passive House Podcast Mary James and Jay Fox chat with Sarah Lewis, Research and Policy Director at the Passivhaus Trust. They explore Scotland’s groundbreaking push toward mandatory Passive House standards for new buildings. Sarah dives into the motivations behind the proposed legislation, lessons from Germany and Brussels, …
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240: Smart Living Spaces with Sharon Robinson
50:48
50:48
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50:48In this episode of the Passive House Podcast, Matthew Cutler-Welsh talks with Sharon Robinson of Smart Living Spaces. Sharon shares her journey from standard design work to advocating for high-performance, affordable housing. She talks about how rethinking client communication, redefining “standard plans,” and focusing on building science fundament…
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239: Campus Firsts: Mass Timber and Carbon Goals in Maine
1:04:28
1:04:28
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1:04:28In this episode of the Passive House Podcast Architect Nat Madson and structural engineer Lauren Piepho of HGA join us to talk about Barry Mills Hall and the John and Lile Gibbons Center for Arctic Studies—Bowdoin College’s first mass timber buildings and the first of their kind in Maine. They share the story behind the design and construction, fro…
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238: Designing The Monarch with Vincent Bergeron
57:00
57:00
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57:00In this episode of the hosts Mary James and Jay Fox sit down with Vincent Bergeron, an architect with Equipe A Architects in Quebec, to explore The Monarch—a groundbreaking social housing project in Sherbrooke. With 134 units guaranteed affordable for 35 years, this high-rise development is notable not only for its scale but for its ambitious pivot…
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In this seventh episode of The Reimagine Edit (TRE) series of the Passive House Podcast, host Zack Semke shares selected clips of insights from Jessica Grove Smith (Joint Managing Director of Passive House Institute), Mark Attard, Rainger Pinney, John Loercher, Galen Staengl, Mike Fowler, Cait Eggers, Sean Velez, Nidhi Shaw, and Lloyd Alter. Quotes…
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237: Committing to Performance with Mark Anderson
46:44
46:44
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46:44In this episode of the Passive House Podcast we are joined by Mark Anderson a Registered Master Builder, Licensed Building Practitioner, and Certified Passive House Tradesperson based in Wanaka, New Zealand. Mark founded MA Building in 2013, driven by a commitment to craftsmanship, sustainability, and innovation in residential construction. Growing…
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236: Insights from the International Builder Show with Shannon Pendleton of Source 2050
1:00:22
1:00:22
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1:00:22This week on the Passive House Podcast, Jay and Mary welcome Shannon Pendleton, of Source 2050 and Sanderson Sustainable Design, to share her insights from the massive International Builders Show (IBS) in Las Vegas. From electrification trends to American-made high-performance windows, Shannon breaks down where the building industry is headed and h…
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235: Passive House Pools with Jessica Grove Smith
1:00:32
1:00:32
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1:00:32In this episode of the Passive House Podcast, Mary James and Jay Fox dive into passive leisure centers and indoor pool design with Jessica Grove-Smith, Senior Scientist and Joint Managing Director of the Passive House Institute. Jessica shares the story of how PHI began exploring high-humidity building typologies, the unique challenges of designing…
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TRE 06: From Resilience to Prefab to Building the Future
41:52
41:52
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41:52In this sixth episode of The Reimagine Edit (TRE) series of the Passive House Podcast, host Zack Semke shares selected clips of insights from Carmel Pratt (Massive Passive AMA); Graham Irwin and Silas Patlove (Duck Curve Friday AMA); Lloyd Alter (Sufficiency First AMA); Sara Kudra, Bev Craig, Rainger Pinney, Kristof Irwin, and Alexander Gard-Murray…
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234: Building Passive Schools with Architype
46:44
46:44
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46:44In this episode of the Passive House Podcast, Mary James sits down with Hugh Pearce, architect and Passive House lead at the UK-based firm Architype. Known for trailblazing sustainable educational design, Architype is behind landmark projects like the UK’s first Passive House secondary school. Hugh shares insights into the London Docks Secondary Sc…
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In this episode of the Passive House Podcast Ilka is at McGill University for the Reconstruct Workshop, a workshop bringing together students, researchers, and industry leaders to tackle the future of deep energy retrofits. Ilka sits down with emerging voices from architecture and engineering to unpack prefab innovation, the Single Integrated Manuf…
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232: Making Passive Possible with Joseph Lyth
50:49
50:49
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50:49In this episode of the Passive House Podcast Matthew Cutler-Welsh sits down with Joseph Lyth an Associate Registered Architect, Certified Passive House Designer based in New Zealand. Joesph walks Matthew through his decision to build a passive house to create a healthier environment for his family. Believing that healthier, lower energy and afforda…
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231: Building the Movement: BuildingEnergy Boston '25
58:41
58:41
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58:41In this special episode of the Passive House Podcast Ilka Cassidy is joined by Kristoff Irwin of Positive Energy at NESEA's BuildingEnergy Boston '25. Ilka and Kristoff are joined by the following inspiring speakers and organizers of NESEA 25: Jacob Deva Racusin, New Frameworks Natural Design/Build Andrew Himes, Carbon Leadership Forum Laura Bailey…
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TRE 05: Paradigms, Retrofits, and How To Sell Passive House
40:03
40:03
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40:03In this fifth episode of The Reimagine Edit (TRE) series of the Passive House Podcast, host Zack Semke shares selected clips of insights from Ryan Abendroth (how to get into PH consulting), Michael Ingui (how to sell Passive Hosue), Kristof Irwin (paradigms in high performance building), and Tom Bassett-Dilley (retrofits and embodied carbon). The R…
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230: Designing for Fire Resilience with Tonje Wold-Switzer
1:00:53
1:00:53
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1:00:53In this episode of the Passive House Podcast, Mary James and Jay Fox sit down with Tonje Wold-Switzer, Executive Director of the Santa Cruz County Long Term Recovery Group. Tonje shares her personal journey of losing her home, navigating the recovery process, and advocating for fire-resilient, sustainable rebuilding solutions—including Passive Hous…
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229: Building Airtight Homes with Barry Cope
48:02
48:02
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48:02In this episode of the Passive House Podcast, we welcome Barry Cope, Group Managing Director of the Building Compliance Testers Association (BCTA). Barry shares insights into airtightness testing, certification, and how the UK became a leader in 100% blower door testing for new buildings. He discusses the role of ATTMA, the evolution of the industr…
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228: Kirstie Wulf on Hempcrete & Resilient Homes
44:54
44:54
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44:54In this episode of the Passive House Podcast, Matthew Cutler-Welsh sits down with Kirstie Wulf of Shelter Building Design. Based in Australia’s Blue Mountains, Kirstie shares how she built her own hempcrete home, the benefits of this natural material, and how it stands up to fire, floods, and extreme weather. If you’re curious about sustainable bui…
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